I'm taking the head off my 73 220D, and as I was lining up the camshaft timing I naturally had a look to see what the chain stretch was - well it was 20+ degrees. I didn't even think that was possible with a diesel. Obviously something is wrong and assuming that the timing is correct is it easier to replace the chain after I have the rest of the engine back together, or while I have it apart? I am digging through my manual for OM615 chain replacement but haven't found it yet.

Thanks!

__________________
kalpol
79 280SE
82 Fiat Spider 2000
81 Fiat Brava
04 BMW R1150RT
96 Jeep Grand Cherokee